Tappet



Get 9 19230 HA'ZOAM M. M. WHLCOX TAPPET Original Filed Sept. 19 1919INVENTOR 7 ATTORNEY Patented @ct.

MERRILL M. WILOOX. 0F SAGINA'W, MICHIGAN, ASSIGNOR T0 WILGOX MOTOR?AIRTS do MANUFACTURING (.70., OF SAGINAW, MICHIGAN, A CORPORATION OFMICHIGAN.

Continuation of application Serial "No. 324,959, filed September 19,1919. This application filed May 23,

Serial No. 471,835.

To all 7,01 1 omit may concern Be it known that I, MERRILL M. llrnoox, acitizen of the United States, residing at Saginaw, in the county ofSaginaw and State of Michigan, have invented certain new and usefulImprovements in Tappets; and I do hereby declare the following to be afull, clear, and exact description or the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

This invention relates to valve-actuating tappets for internalcombustion engines, and pertains more particularly to certain novelfeatures of construction embodied in a valve tappet as a new article ofmanufacture, whereby I am enabled to produce an exceptionally light butstrongtappet, with an enlarged base of very hard metal such ascase-hardened steel to contact with the engine cam, and an internallythreaded plug in the opposite end of the tappet'to receive the bolt orother adjustable device that contacts with the stem out the valve.

The arrangement of parts in my improved tappet construction is such thatthey can be easily, quickly and accurately assembled and the individualparts can be manufactured at smallcost and by automatic machines ofstandard construction, insuring uniformity of size and shape and weight.

With the foregoing and certain other objects in view, which will appearlater in the specification, my invention comprises the devices describedand claimed and the equivalents thereof.

My invention is illustrated in the accompanying drawings, in which Fig.1 is a central longitudinal section ota tappet.

Fig. 2 is a partial section'ot a tappet showing a means for holding theplug in place.

Fig. 3 is a side View of a modified form of plug.

Fig. 4 is a part section of a tappet showing a still Further modifiedmeans for securing the plug in the end of the tappet.

As is clearly shown in the drawings, the tappet consists of the usualshell or body portion 1, which is preferably formed by )Oring a solidbar of metal from end to end to form a thin-walled tube;'or the bodv maybe formed of sheet metal rolled to the formed on the head and accuratelyfitted to and preferably received in the bore of the body 1, to which itmay be secured by spot Welding, as in Fig. 1, or by any other practicalor well-known means of securing cylindrical members in tubular members.

The broader aspects of my invention are described and claimed in myco-pending application, Serial No. 321,959, of which this presentapplication is a continuation.

The other end of the tubular body is provided with a plug or closure 3threaded as at 4, adapted to receive a push rod not 1 shown, againstwhich the valve stem of the engine contacts in action. The closure 3 ispreferably in the form of a plug, adapted to be received within the boreof the tubu-v lar body 1 and to be secured therein by any suitablemeans, as for example, by spot Welding. v

To firmly seat the plug 3 in the body 1 at exactly the right verticaldistance to suit the required overall length of the tappet, I preferablyprovide a shoulder 5 Within the body 1, the shoulder being: formed bycounter-boring. The shoulder acts as a stop to locate the plug properlyand hold it in position when the tappet is being assembled.

The plug may be secured in place in the body 1 by threading and screwingit into the body, as shown at 6 in Fig. 2, or it may be externallyrecessed, as shown at 8 in Fig. 3, the metal of the body 1 beingcorrespondingly pressed in to hold the plug in place. In some cases Isecure the plug in place by swaging over the upper edge'? of the shellto form an inwardly projecting retaining flange.

Any or all of the above forms of plugs may in addition be spot welded inplace it desired.

By the means above described, I have produced a tappet of light weightand great strength. The. parts are adapted to'be easily and economicallymanufactured by automatic machinery and can be rapidly and accuratelyassembled. either by semiautomatic machinery, or by hand.

The construction of plug 3, as shown in the drawings, is such as toenable the plug to be made of one piece of round bar that can be cutwith a minimum of waste, requiring no machine work to fit it to thecounter bore andshoulder 5 of the tubular body 1.

Having thus described my invention, what I claim and desire to secure byLet ters Patent is:

1. As an article of manufacture, a tappet comprising a hollow tubularbody, a hardened head having an elongated cylindrical shank fixed tosaid body, the opposite end of said body formed with an enlarged boreand an internal shoulder at the end of said bore, a cylindrical plugreceived entirely within said enlarged bore and abutting against saidinternal shoulder, said plug fixed to said body, the outer end of saidplug flush with the end of said tubular body.

2. As an article of manufacture. a tappet comprising a hollow tubularbody. a cam-contacting head fixed to said body, the opposite end of saidtubular body formed within an enlarged bore and an internal shoulder atthe end of said bore, a substantially cylindrical plug received entirelywithin said enlarged bore and abutting against said internal shoulder,said plug fixed to said tubular body.

In testimony whereof, I aliix my signa' ture.

MERRILL M. WILC-OX.

